Year	% of land area
1992	6.882168925964546
1993	7.0490093847758075
1994	7.0594369134515125
1995	7.069864442127216
1996	7.075078206465067
1997	7.08029197080292
1998	7.090719499478623
1999	7.132429614181439
2000	7.069864442127216
2001	7.007299270072993
2002	7.012513034410844
2003	7.007299270072993
2004	6.9551616266944745
2005	6.694473409801876
2006	6.692909280500521
2007	6.673618352450469
2008	6.6710114702815435
2009	6.652763295099061
2010	6.653806047966632
2011	6.652241918665276
2012	6.655891553701773
2013	6.6668404588112615
2014	6.67674661105318
2015	6.67674661105318
2016	6.714285714285714
2017	6.714285714285714
2018	6.715328467153285
2019	6.712200208550574
2020	6.712200208550574
2021	6.712200208550574